Tension attachment for shears.



H. GLAUSS.

TENSION ATTACHMENT FOB. SHBARS.

nrmonmn nun MAY 21, 1909.

1 ,020,4;00, Patented Mar. 19, 1912.

Fig. 4.

HENRIE CL-AUSS,

0F FREMONT,

OHIO.

TENSION ATTACHMENT FOR SHEARS.

To all whom it may concern:

Be it known that I, HnNnm CLAUss, a citizen of the United States, residing at Fremont, in the county of Sandusky, State of Ohio, have invented certain new and useful Improvements in Tension Attach ments for Shears; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to a tension device for shears, and consists in the construction and arrangement hereinafter more fully set forth and claimed.

The object of the invention is to provide an etficient tension device by means of which any desired tension upon the shear blades may be attained, the arrangement being such that when the tension device is once set, it cannot be changed by a manipulation of the shears.

The invention further contemplates the mounting of the pivot bolt rigidly on the tension member entirely independent of the shears.

The above object is attained by the structure illustrated in the accompanying drawings, in which Figure 1 is an elevation of a pair of shears provided with my improved tension device. Fig. 2 is an enlar ed transverse section as on line 22 of Fig. 1. Fig. 3 is an enlarged view of the tension member partly in section and the pivot bolt upon which the shear blades are mounted, rigidly secured to one end of said tension member. Fig. 4 is a perspective view of the tension member. Fig. 5 is a perspective view of the pivot bolt.

Referring to the characters of reference, 1 and 2 designate the shear blades respectively provided with the usual handles and pivotally mounted upon the transverse bolt 3. The bolt 3 at one end is provided with the threads 4: to receive the knurled nut 5 adapted to screw thereon, and near its opposite end said bolt is provided with the beveled annular bearing shoulder 6 adapted to lie in the counterbore of the aperture in the shear blade 2 through which the pivot bolt passes.

The tension member is in the form of a Specification of Letters Patent.

Application filed May 27, 1909.

Patented Mar. 19, 1912.

Serial No. 498,704.

spring clevis 7, the loop portion of which normally lies between the handles of the shear blades. One terminal of said tension member is provided with an aperture 8 (see Fig. 4) adapted to receive the reduced end portion 9 of the bolt 3 which is riveted in said aperture to rigidly join the tension member and bolt, as clearly shown in Figs. 2 and 3. The other terminal of the tension member is provided with a larger aperture 10 to freely receive the other end portion of said bolt, as clearly shown by dotted lines in Fig. 3.

After the pivot bolt 3 shall have been secured to one terminal of the tension member, the parts are assembled by passing said bolt through the registering apertures in the blades of the shears, then springing the free end of the tension member over the projecting end of the pivot bolt and screwing the nut 5 onto said bolt to crowd the tension member against the face of the shear blade 1, as shown in Fig. 2. Because of the fact that the pivot bolt is rigidly secured to one end of the tension member, said bolt is held independently of the shear blades and cannot be affected by any movement of the blades thereon. By this arrangement the pivot bolt remains fixed and cannot be turned by the actuation of the shear blades to rotate its threaded end in the nut 5, and thereby release the tension on the blades. It will further be seen that as the nut 5 engages the outer face of the end of the tension member through which the bolt passes, and which lies against the face of the shear blade, the movement of said blade cannot affect said nut to turn it off of the threads of the bolt. Attention is also called to the fact that the tendency of the free end of the tension member is to spring outwardly, whereby a continual outward pressure is exerted by the spring tension of said member against the nut 5, which pressure assists in binding said nut on the bolt and preventing it being accidentally turned thereon to inadvertently vary the tension on the shear blades. B y turning the nut 5 in either direction, any desired tension may be placed upon the blades of the shears at will, which tension is not affected by the actuation of the shear blades and remains constant.

Having thus fully set forth my invention, what I claim as new and desire to secure by Letters Patent, is

1. A tension attachment for shears comprising a looped spring member embracing the blades, a bolt passing freely through the blades, said bolt at one end being riveted to one terminal of said spring member to permanently and rigidly attach it thereto, the other end of said bolt passing freely through the other terminal of said member, and a nut upon said bolt to force the free terminal of the looped member against the face of the shear blade.

2. A tension attachment for shears, the combination With the blades, of a looped member embracing the blades, said blades being apertured and one of them having a counterbore therein, a pivot bolt passing freely through the apertured blades, said bolt near one end having an annular con- Copies of this patent may be obtained for centric shoulder Which lies in said counterbore in one of said blades, one terminal of the looped member lying against the outer face of said shoulder and having an aperture in Which the projecting end of the pivot bolt is riveted, the opposite end of the pivot bolt passing through the other terminal of the looped member, and a nut upon said bolt to bind the terminal of the looped member against the face of the shear blade.

In testimony whereof, I sign this specification in the presence of tWo Witnesses.

HENRIE CLAUSS.

WVitnesses C. M. HANDY, E. MEHEN.

five cents each, by addressing the Commissioner of Patents, Washington, 1). G. 

